/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2000 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ident	"%Z%%M%	%I%	%E% SMI"


	/*
	 * The interrupt reason can be interpreted
	 * from other bits as follows:
	 *
	 *  DRQ  IO  CoD
	 *  ---  --  ---
	 *    0   0    1  Idle
	 *    1   0    1  Send ATAPI CDB to device
	 *    1   1    0  Data from device
	 *    1   0    0  Data to device
	 *    1   1    1  Future use
	 *    0   1    1  Status ready
	 *
	 */

			ACTION

			ATAPI Status Bits
Current	|			
State	|	idle	cdb	datain		dataout		status
        |-----------------------------------------------------------------
idle	|	cmd	cmd	cmd		cmd		cmd
command	|	*	sendcdb	*		*		rd-intr-reason
cdb	|	*	*	start-xfer	start-xfer	rd-intr-reason	
datain	|	*	*	continue-xfer	*		rd-intr-reason
dataout	|	*	*	*		continue-xfer	rd-intr-reason



			NEXT-STATE

			ATAPI Status Bits
Current	|			
State	|	idle	cdb	datain		dataout		status
 	|-----------------------------------------------------------------
idle	|	command	command	command		command		command
command	|	*	cdb	*		*		*
cdb	|	*	*	datain		dataout		(idle)
datain	|	*	*	datain		*		(idle)
dataout	|	*	*	*		dataout		(idle)



States marked '*' should be invalid but some non-complaint drives
don't transition correctly between states. 
